: In telegraph or data transmission
systems, that method of communication in which the operator at a station must keep a switch
operated in order to send messages.
Note 1: Push-to-type operation is used in radio systems where the same frequency is employed for transmission and reception.
Note 2: Push-to-type operation is a derivative form of transmission and may be used in simplex, half-duplex, or duplex operation. Synonym press-to-type operation.
Note 3: This is similar to Push-to-talk operation for radio phone communications.
Source: From Federal Standard 1037C and from MIL-STD-188